Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: EC:3.4.21.4 (trypsin)
 42,187 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Antisera to human oral epithelial cells were produced in rabbits and found to be specific for epithelial type cells of man, guinea-pig and rabbit. Binding of the antisera to human oral epithelial cells was not affected by pre-incubation in concanavalin A, trypsin or neuraminidase, nor by pre-incubation of the antisera with fetuin. The antisera would appear to differ from pemphigus antiserum.
 ...
PMID:Antiserum to the cell surface of oral epithelial cells: relationship to pemphigus antiserum. 63 39

Lysosomal fraction was isolated from rat liver by density gradient centrifugation after pervious loading of lysosomes in vivo with Triton WR-1339. Tritosome preparations were incubated at 37 degrees C and pH 5 for 24 hr with purified human ceruloplasmin or haptoglobin. After this period approximately 20% of total alpha amino nitrogen was released from ceruloplasmin and over 40% from haptoglobin. This was accompanied by loss of peroxidase activity of haptoglobin (in complex with haemoglobin), while enzymatic activity of ceruloplasmin remained unaltered. Removal of sialic acid by neuraminidase had no effect on digestion of ceruloplasmin by rat liver tritosomes. Both glycoproteins were resistant to horse leucocyte proteinases and pancreatic eleastase but were easily inactivated by trypsin and chymotrypsin.
 ...
PMID:Degradation and inactivation of ceruloplasmin and haptoglobin by rat liver lysosomes and some other proteinases. 65 34

Chick brain synaptosomes or synaptic subfractions were treated with neuraminidase (EC 3.2.1.18) and/or galactose oxidase (EC 1.1.3.9) preparations in which proteolytic activity was inhibited with phenylmethanesulfonyl fluoride followed, after washing, by reductive incorporation of sodium boro[3H]hydride to identify galactose residues exposed on the synaptosomal external surface. Control experiments to demonstrate restriction of labeling to the external surface involved comparing the radioactivity in synaptoplasmic, soluble polypeptides isolated after labeled, isolated synaptoplasm and examining incorporation into fractions incubated without enzymes. Intactness of the synaptic plasma membrane after labeling was shown by trypsin digestion studies. Polypeptides were separated on sodium dodecyl sulfate polyacrylamide gels and were detected by a liquid scintillation counting procedure. Eleven major radioactive peaks were found after galactose oxidase treatment and reduction of isolated synaptic membranes. When intact synaptosomes were labeled, the same components were detected. When isolated synaptic membranes or intact synaptosomes were treated with neuraminidase before galactose oxidase treatment, three additional components were labeled. These results suggest that (a) chick synaptic membranes have a complex mixture of glycoproteins, (b) all major chick synaptic membrane glycoproteins labeled by galactose oxidase have most or all carbohydrate groups exposed at the exterior surface of the synaptosome, (c) all major, externally-disposed polypeptides of these synaptic membranes are glycoproteins.
 ...
PMID:Topography of glycoproteins in the chick synaptosomal plasma membrane. 66 29

Radioiodinated normal rabbit IgG was used to detect Fc receptors on the surface of HeLa S3-2 cells infected with herpes simplex virus (HSV). Unlike the Fc receptors present on most leukocytes, these virus-induced Fc receptors were found to be sensitivite to trypsin at concentrations of enzyme as low as 0.1 mg/ml. Treatment of infected cells with neuraminidase enhanced the binding of IgG. Yet the HSV-induced Fc receptor(s) is probably a glycoprotein because its synthesis was inhibited by 2-deoxy-D-glucose at concentrations inhibiting glycoproteins but not total proteins. Binding of radioiodinated IgG to Fc receptors on infected HeLa S3-2 cells was unaffected by F(ab')2 fragments prepared from antisera against uninfected HeLa S3-2 cells or against human beta2-microglobulin. By contrast, anti-HSV F(ab')2 or Fab' fragments decreased binding of radioiodinated IgG to HSV-infected cells by 85%, and binding of radioiodinated Fc was also inhibited by anti-HSV Fab'.
 ...
PMID:Fc receptors induced by herpes simplex virus. I. Biologic and biochemical properties. 68 55

ZGM was purified from both primary and metastatic colonic carcinomas demonstrably positive for ZGM by immunofluorescence microscopy. ZGM purification included preparative Pevikon electrophoresis, Sepharose 4B molecular exclusion chromatography and Con A-Sepharose affinity chromatography. ZGM had an alpha2 electrophoretic mobility, an estimated molecular weight by Sepharose 4B equal to or greater than 2 x 10(6), and did not bind to Con A-Sepharose, although having determinants with CEA-like activity. Its immunologic activity was resistant to trypsin or phospholipase A but not to neuraminidase. Antisera prepared to ZGM and absorbed with saliva, when tested by double immunodiffusion, formed a single precipitation line with saline extracts of colon tumors and did not cross-react with CEA, AFP, normal tissue extracts, ferritin, NCA, NCA-2, CSAp, blood groups A, B, H, Lewis antigen, or buffy coat, alpha-2 macroglobulin, saliva or ovarian cyst fluid. Immunofluorescence microscopy confirmed the presence of ZGM in 40 out of 45 adenocarcinomas of the GI tract staining primarily in tumors, the apical cytoplasm, and in grossly nonmalignant tissues, the deep crypts of the villi, while all of 22 non-GI tumors in the study were ZGM negative.
 ...
PMID:Present status of the zinc glycinate marker (ZGM). 70 28

A comparison was made of the activity of synovial fluid (SF) lymphocytes with peripheral blood lymphocytes in antibody-mediated and mitogen-induced lymphocyte cytotoxicity in patients with a variety of inflammatory joint diseases. SF lymphocytes consistently showed little or no antibody-mediated cytotoxicity (AMC) although mitogen-induced cytotoxic activity was comparable with that of the peripheral blood lymphocytes. Blocking substances on the cell surface were not responsible for the lack of AMC by SF lymphocytes as preincubation at 37 degrees C and enzyme treatment (trypsin, neuraminidase) of the cells did not restore activity. The lack of AMC by SF cells from a variety of inflammatory joint fluids demonstrates that this may be a consequence of inflammation in the joint and excludes the possibility that this is a specific property of fluids from certain conditions such as rheumatoid arthritis. Lymphocytes thought to be involved in AMC have a characteristic surface morphology (Fc receptor positive, E rosette negative, surface immunoglobulin negative). Such lymphocytes are present in synovial fluid in comparable proportions to those in blood. Hence the absence of AMC indicates that functional assays must be used in determining the presence or absence of cells with special functions.
 ...
PMID:Lymphocyte studies in rheumatoid arthritis. II. Antibody-mediated and mitogen-induced lymphocyte cytotoxicity in synovial fluid and peripheral blood. 71 73

The hemolytic action of a homologous series of sodium alkyl sulfates (C8 to C15) on dog and human erythrocytes was measured. The influence of trypsin, pronase and neuraminidase treatments on the lytic resistance of human red cells was studied. A new approach evaluating the hemolytic activity of ionic surfactants is expressed as a ratio of a concentration providing 50% lysis to its CMC-value. The results obtained are examined for their bearing on the use of surfactants as a means to study the structure organization of biological membranes.
 ...
PMID:[Effect of chemical modification of the surface of erythrocytes on their stability to the hemolytic action of sodium alkyl sulfates]. 71 73

The effects of various treatments on erythrocyte shape, surface, cell coat and calcium binding sites have been investigated by means of high voltage electron microscopy (HVM), scanning electron microscopy (SEM) and conventional electron microscopy (TEM). Papain caused the formation of small blisters within the cellular surface as well as crenation and 'budding' of the erythrocytes. After neuraminidase treatment, long filaments were observed to radiate from the surface of the erythrocyte. The other enzymes investigated, RNA'se DNA'se, phospholipase, protease and trypsin, produced no demonstrable effect on the cellular structure, nor (with the possible exception of trypsin) on the cell coat as seen by subsequent staining with ruthenium red. Putative calcium binding sites on and in the erythrocyte membrane were demonstrated. Following incubation with radioactive calcium, activity was found in the erythrocyte membranes. Calcium binding could be reduced by prior treatment of the erythrocyte with EDTA, neuraminidase, and to a lesser extent, by papain and trypsin. Other enzymes had no demonstrable effect. Stored erythrocytes showed a progressive diminution in calcium binding over a period of up to 4 weeks.
 ...
PMID:Localization and role of calcium in the erythrocyte coat: effects of enzymes and storage. 72 71

Treatment of cattle red cells (CRC) with proteases and neuraminidase revealed at least one trypsin- or pronase-sensitive type and a protease-resistant type of sialoglycoprotein. The antigen F itself and the antigen IM in the F/F and F/V type of CRC were associated with the protease-resistant glycoprotein. Moreover, they were demonstrable in the agglutination test, but only after treatment with proteases. The antigen V, allelic to F, was, however, associated with a pronase-sensitive protein and the antigen IM in the V/V type of CRC with a trypsin- or pronase-sensitive glycoprotein. The antigen N' was inactivated by chymotrypsin or pronase, irrespective of whether it was transmitted with the F or with the V. While the antigens IM, N' and the antigen reacting with rabbit serum, in addition to the antigen F in the F/F type of CRC, showed no or only very weak (titre 1:2) reactions, these same antigens, in addition to the antigen V in the V/V type of CRC, all showed high titres (1:32 to 1:128) in the anti-globulin test.
 ...
PMID:The effects of enzymes on the blood factors associated with the FV system of bovine erythrocytes. 73 Oct 67

Vibrio cholerae neuraminidase (VCN) treatment of donor bone marrow cells results in a reduction in the number of hematopoietic colonies (CFUs) formed in the spleens of lethally irradiated mice. Treatment of marrow cells with sodium periodate under mild conditions, known to preferentially oxidize sialic acid, also reduced CFUs while subsequent potassium borohydride reduction restored CFUs to 80% of control levels. Innoculum viability as measured by in vitro incorporation of tritiated precursors into proteins, nucleic acids, and oligosaccharides was unaffected by VCN treatment. The ability of bone marrow cells in culture to respond to the hormone erythropoietin, as measured by the incorporation of 59Fe into cyclohexanone-extractable heme, was also not affected by neuraminidase, making a cytotoxic effect of the VCN preparation unlikely. Incubation of VCN-treated marrow with either beta-galactosidase or trypsin had no effect on the VCN-induced reduction in CFUs. These results are consistent with the idea that membrane sialic acid plays a direct and specific role in the implantation and development of CFUs.
 ...
PMID:Sialic acid: a specific role in hematopoietic spleen colony formation. 73 8


<< Previous 1 2 3 4 5 6 7 8 9 10 Next >>